include/linux/reiserfs_xattr.h

   1 /*
   2   File: linux/reiserfs_xattr.h
   3 */
   4
   5 #include <linux/config.h>
   6 #include <linux/init.h>
   7 #include <linux/xattr.h>
   8
   9 /* Magic value in header */
  10 #define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
  11
  12 struct reiserfs_xattr_header {
  13         __le32 h_magic;         /* magic number for identification */
  14         __le32 h_hash;          /* hash of the value */
  15 };
  16
  17 #ifdef __KERNEL__
  18
  19 struct reiserfs_xattr_handler {
  20         char *prefix;
  21         int (*init) (void);
  22         void (*exit) (void);
  23         int (*get) (struct inode * inode, const char *name, void *buffer,
  24                     size_t size);
  25         int (*set) (struct inode * inode, const char *name, const void *buffer,
  26                     size_t size, int flags);
  27         int (*del) (struct inode * inode, const char *name);
  28         int (*list) (struct inode * inode, const char *name, int namelen,
  29                      char *out);
  30         struct list_head handlers;
  31 };
  32
  33 #ifdef CONFIG_REISERFS_FS_XATTR
  34 #define is_reiserfs_priv_object(inode) IS_PRIVATE(inode)
  35 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
  36 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
  37                           void *buffer, size_t size);
  38 int reiserfs_setxattr(struct dentry *dentry, const char *name,
  39                       const void *value, size_t size, int flags);
  40 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
  41 int reiserfs_removexattr(struct dentry *dentry, const char *name);
  42 int reiserfs_delete_xattrs(struct inode *inode);
  43 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
  44 int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
  45 int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd);
  46
  47 int reiserfs_xattr_del(struct inode *, const char *);
  48 int reiserfs_xattr_get(const struct inode *, const char *, void *, size_t);
  49 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
  50
  51 extern struct reiserfs_xattr_handler user_handler;
  52 extern struct reiserfs_xattr_handler trusted_handler;
  53 #ifdef CONFIG_REISERFS_FS_SECURITY
  54 extern struct reiserfs_xattr_handler security_handler;
  55 #endif
  56
  57 int reiserfs_xattr_register_handlers(void) __init;
  58 void reiserfs_xattr_unregister_handlers(void);
  59
  60 static inline void reiserfs_write_lock_xattrs(struct super_block *sb)
  61 {
  62         down_write(&REISERFS_XATTR_DIR_SEM(sb));
  63 }
  64 static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
  65 {
  66         up_write(&REISERFS_XATTR_DIR_SEM(sb));
  67 }
  68 static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
  69 {
  70         down_read(&REISERFS_XATTR_DIR_SEM(sb));
  71 }
  72
  73 static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
  74 {
  75         up_read(&REISERFS_XATTR_DIR_SEM(sb));
  76 }
  77
  78 static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
  79 {
  80         down_write(&REISERFS_I(inode)->xattr_sem);
  81 }
  82 static inline void reiserfs_write_unlock_xattr_i(struct inode *inode)
  83 {
  84         up_write(&REISERFS_I(inode)->xattr_sem);
  85 }
  86 static inline void reiserfs_read_lock_xattr_i(struct inode *inode)
  87 {
  88         down_read(&REISERFS_I(inode)->xattr_sem);
  89 }
  90
  91 static inline void reiserfs_read_unlock_xattr_i(struct inode *inode)
  92 {
  93         up_read(&REISERFS_I(inode)->xattr_sem);
  94 }
  95
  96 static inline void reiserfs_mark_inode_private(struct inode *inode)
  97 {
  98         inode->i_flags |= S_PRIVATE;
  99 }
 100
 101 #else
 102
 103 #define is_reiserfs_priv_object(inode) 0
 104 #define reiserfs_mark_inode_private(inode) do {;} while(0)
 105 #define reiserfs_getxattr NULL
 106 #define reiserfs_setxattr NULL
 107 #define reiserfs_listxattr NULL
 108 #define reiserfs_removexattr NULL
 109 #define reiserfs_write_lock_xattrs(sb) do {;} while(0)
 110 #define reiserfs_write_unlock_xattrs(sb) do {;} while(0)
 111 #define reiserfs_read_lock_xattrs(sb)
 112 #define reiserfs_read_unlock_xattrs(sb)
 113
 114 #define reiserfs_permission NULL
 115
 116 #define reiserfs_xattr_register_handlers() 0
 117 #define reiserfs_xattr_unregister_handlers()
 118
 119 static inline int reiserfs_delete_xattrs(struct inode *inode)
 120 {
 121         return 0;
 122 };
 123 static inline int reiserfs_chown_xattrs(struct inode *inode,
 124                                         struct iattr *attrs)
 125 {
 126         return 0;
 127 };
 128 static inline int reiserfs_xattr_init(struct super_block *sb, int mount_flags)
 129 {
 130         sb->s_flags = (sb->s_flags & ~MS_POSIXACL);     /* to be sure */
 131         return 0;
 132 };
 133 #endif
 134
 135 #endif                          /* __KERNEL__ */